Respiration Quick Check

Gases diffuse most efficiently across a

Oxygen constantly diffuses from air or water into an animals bloodstream. For this to happen the concentration of oxygen in the blood must be

An organism might rely on the diffusion of oxygen and carbon dioxide through their outer body covering if it is

Mantle cavities, tracheal tubes, and book lungs are all types of respiratory structures in

In what way does living on land present a challenge to terrestrial animals